Accelerate Healing

By accelerating the flow of time around a wound you can shorten the time needed for it to close by primary healing.

After 1 minute of casting the targeted creature can spend and roll up to two of its unspent Hit Dice and regain a number of hit points equal to the roll plus the casters level. (You only add the caster level once)

At higher levels. The number of Hit Dice that can be spent and added to the healing roll is equal to the spell slot used in the casting of this spell (3 Hit Dice for 3 level spell slot and so on)